Heat exchange apparatus



Nov. 17, 1931. c. o. SANDSTROM HEAT EXCHANGE APPARATUS Filed Nov. 8,1930 2 shets sheet 1 w. .w. .wHQ

R mm NM M Hwwwmmnwwwga Nov. 17, 1931. c. o. SANDSTROM HEAT EXCHANGEAPPARATUS 2 Sheets-Shee 2 Filed NOV. 8, 1930 Patented Nov. 17, 1931PATENT OFFICE CHARLES O. SANDSTROM, OF LOS ANGELES, CALIFORNIA HEATEXCHANGE APPARATUS Application filed November 8, 1930. Serial No.494,309.

This invention relates to a heat exchange apparatus or heat exchangerand relates par ticularly to a heat exchanger which is adapted for useinvolving small quantities of fluid.

] Heat exchangers now'on the market are relatively expensive andinefficient when they are built in sizes for handling only a relativelysmall quantity of fluid.

It is the general object of the present invention to provide a heatexchanger of suitable design for efiiciently securing transfer of heatin anexchanger embodying only a small number of tubes.

. It is a further object of the present invention to provide a heatexchanger which is compact and inexpensive in construction and which canbe readily altered to change the number of passages of fluid through theexchanger so that the fluid may be caused to i r pass through all of thetubes in series or,when

it is desired, through a number of the tubes in parallel.

Various further objects and advantages of the present invention will beapparent from the description of a preferred form or example of heatexchanger embodying the invention. For this purpose, I have hereinafterdescribed one form or example of a heat exchanger which embodies thisinvention, the description being given with reference to theaccompanying drawings, in which Figure 1 is an elevation;

Figure 2 is an enlarged elevation mainly in section and with the centerof the exchanger broken away to contract the view;

Figure 3 is a section on the line 33 of Figure 2 taken through thereturn cap at one end of the apparatus; a

Figure 4 is a section taken on the line t4 of Figure 2 through thereturn cap at the inlet and discharge end of the apparatus; Figure 5 isa sectionon the line55 of Figure 2 taken through ports in the baflles ofthe exchanger; and

Figure 6 is a perspective of the tube sheet 3. Referring to thedrawings, the heat exchanger comprises a small tube sheet 2 at the inletand discharge end of the, apparatus and a further tube sheet 3 at theother end of the apparatus.

A plurality of tubes is rolled into the tube plates or sheets 2 and 3 1nthe usual manner so as to extend between the tube sheets and provide aplurality "of titions 14, 15 and 16, the partitions 13 and I 14separating the cap into a chamber which j willpermitfluid to flowfromthe inlet 11 into only the tube 4. V V v V The partitions 14C and 15provide a chamber for interconnecting the tubes 5 and 6. The partitions15 and 16 provide a chamber for connecting the tubes 7 and 8 and the partitions 16 and 13 provide a chamber for connecting the tube 9 with theoutlet 12;

In the opposite end of the exchanger there is provided an additionalreturn cap 17 which is provided with partitions 18, 19 and 20 (see Fig..3). The partitions 18 and 19 provide a chamber to interconnect tubes 4and 5. The partitions 19 and 20'provide a chamber for inter-connectingtubes 6 and and partitions 18 and 20 provide a chamber forinterconnecting tubes Sand 9. F

The caps are provided with stud bolts21 and 22 threaded to the tubesheets 2 and 3, respectively, by means of which the caps 10 and 17 arepressed against the tube sheets.

If desired, gaskets, such as indicated at 23 and 24, may be provided forforminga more fluid-tight joint. 1

The exchanger is also provided with a cylindrical shell 25 which at oneend is preferably welded to a flange 26 which is bolted in place bybolts 27.passing through openings 27 in the tube sheet 3. The tube sheet"3 is shownas provided with an extending foot 28 which serves as aexchanger. 7

At the opposite end of the exchanger the shell 25 is welded to asupporting leg 29 and support for the is extended over the tube sheet 2so as to be freely movably thereon in order to take care of expansionand contraction. This end of the shell is made fluid-tight by means of astufling box provided with a gland 31.

Near one end of the exchanger are welded pipe nipples 32 and 33 which,respectively, provide for the inlet and outlet of the fluid which is toflow over the outside of the tubes 4 to 9 inclusive. In order to causethe fluid flowing over the tubes to .pass .along the tubes there isprovided Within the shell a plurality of U-shape baflle members 34, 35,36, 37, 3S and 39 (see Fig. These U-shape baflies are free to move withexpansion and contraction of the tubes, while their edges bear firmlyagainst the enclosing outer shell 25. Each of the U-shape bafiie membershouses one .of the tubes and provides a compartment by which fluid may.flow along and outside of the tube for transferring heart to the fluidwithin the tube; the baffle 34 enclosing the tube 4; the bafile 35enclosing the tube 5; the battle 36 enclosing the tube 6.; the balfle 37enclosing the .tube 7.; the baffle .38 enclosing the tube 8, and thebaffle .39 enclosing the tube 9.

Atthe ends of the baffles there are provided .p orts tor transferringthe fluid from one U- shaped Ibafiie to the succeeding baflie. Thus, theports 42 .and 43., respectively, at the rear end of the baffles, connectthe baffles .34 and 35. The ports 44 and 45 connect the bailles V 3.6and 41'? and the :ports 4.6 and 47 connect the ba'ifles 3.8 and 39. i

At the opposite end of the .bafiies there are provided additional portsfor connecting in a similar manner the baflles '35 and .36 :and thebafiles .37 and 38 one with the other.

By using the arrangement thus described :the two fluids will flowthrough the-apparatus in the parallel direction. By using the inlet andoutlet ports of the shell Ffor-t-he outlet .and inlet, respectively, thefluids may be caused to flow counter-currently.

As shown most clearly in Fig. 6., the tube sheet .3 has an enlarged discportion 40 :and

a cylindrical hub ,portion 41, the :outer cylindrical wall of which has.a loose fit with the inner -.cylindrical wall of the shell 25.TU-s'haped recesses :are .cut in cylindrical hub 41 of the tube sheet .3radially inwardly of such size as to fit the outer side walls of theU-shaped bafiles 34, 35, 36., .37., 38 and .39, which are shown in Fig.5. Since the aforementioned vbafiles touch together, asshown in Fig. 5,the 'U-shaped ggroove out in .the tube sheet 3 intersects, leaving thesubstantially triangular portions 41. The tube sheet 2 is ofconstruction 'to the tube sheet 3,

. except that the body or disc part of the tube sheet .is .cut off atthe diameter :of the shell 25. 'The tube sheet 3 has the openings 4 .5,6t, 7*, and .9 to receive :the tubes 4,15, 6, 7., .8 and :9,respectively.

--1nay be used as an open or atmospheric type in a cooling tower byremoving the enclosing she'll and the 'U-shape baffles 34 to 39, in-.clusive.

'YVhile the particular form of exchanger herein described is welladapted .to carry out the objects of the present invention, it will beunderstood that various changes and modi ii cations may be made withoutdeparting from the spirit of the invention, and the invention is of thescope set forth in the appended claims.

I claim:

1. A heat exchanger comprising tube sheets, tubes extending between saidtube sheets, caps at the ends of said tubes, a shell enclosing saidtubes, .and a plurality of U- shape baflie members within said shell torhousing said tubes for providing fluid passages around said tubes.

2. A heat exchanger comprising a plurality of tubesarranged in ,acircular series, tube sheets at the end of said tubes, partitioned capsbolted to said tube sheets providing re turn chambers forinterconnecting the tubes, .a shell surrounding said tubes and U-s'hapedbafile members surrounding the individual tubes providing longitudinalpassages for fluid around the tubes, said bafiies having ports forinterconnecting the passages of the different 'baflies.

3. A heat exchanger comprising .a plurality of tubes, tube sheets at theends of said tubes, caps providing return passages for the tubes, ashell enclosing said tubes, and U- .shape baflle members surroundingsaid tubes and engaging said shell to provide fluid passages .aroundsaid tubes, said tube sheets hav-- ing grooves slidably receiving.the'ends of said bafiies.

4. A heat exchanger comprising a single circular series of tubes, tubesheets at the-ends of said tubes, .a cylindrical shell rigid with aflange connected to the tube sheet at one end and having a slidable.connection with the tube sheet at the other end, and baflle means withinsaid shell and surrounding said tubes for forming fluid passages aroundsaid tubes.

5. A heat exchanger comprising a single circular series of tubes, a tubesheet at each end of said tubes, a cap member at each end or the tubesbolted to said tube sheets, said cap members being provided withpartitions forming interconnecting return passages for said tubes, asurrounding shell for said tubes, and baflle members formlnglongitudinal passages around the tubes, said bafile members having meansfor inter-connecting said 1ongitudinal passages.

6. A heat exchanger comprising a circular series of tubes, tube sheetsat the end of said tubes, caps secured to said tube sheets and havingpartitions forming return passages for said tubes, a shell surroundingsaid tubes, and baffles within said shell providing longitudinal fiuidpassages along said tubes, said baflles having ports for interconnectingthe baflie passages in such manner that the fluid flowing around thetubes may pass counter-currently to the fluid within the tubes.

7. A heat exchanger comprising a plurality of tubes, tube sheetsreceiving the ends of said tubes, caps pressed against said tube sheetsand having partitions forming return passages for said tubes, a shellsurrounding said tubes, and U-shape bafile members extendinglongitudinal of the tubes and providing individual longitudinal passagesfor fluid outside of the tubes.

Signed at Los Angeles, California this 24th day of October, 1930.

CHARLES O. SANDSTROM.

